Compilare: main.cpp: In function 'int merge(int, int, int)': main.cpp:41:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 41 | for (int i = 0; i < prov.size(); ++i) | ~~^~~~~~~~~~~~~